For the uninitiated, Jets are very different to drive if you are coming to it from an outboard. For a start it has no rudder in the water, so you have no physical steering
It took me a while to get used to mine and I have a long way to go yet. The 3 levers are throttle, Bucket (scoop) and gearbox. On mine I have forward, neutral and reverse on the gearbox. All manouveres are done with the gearbox in forward, you only put it in reverse to backflush the Jet if it has ingested seaweed, plastic bags etc. Steering is very vague unless you have the jet pumping fairly hard. To maintain steering, it pays to keep the revs up around 1000 RPM to maintain reasonable pump pressure and then put the bucket down a bit to spill some of the thrust downwards and then control the speed with the bucket. All instincts when manouvering in tight spaces is to pull the power off, as you would with an outboard, but with the revs dropped, you will have virtually no steering. Once moving slowly all speed control is done with the bucket and fixed revs. The other tip is to ensure the gearbox is in neutral before you start it and once you have got the the boat up to the jetty etc and its where you want it, put it in neutral as all the time the jet is pumping it will be pushing the boat about.
When going backwards, the steering works in reverse to the way an outboard works. This is because you have the bucket down and the jet pressure is now deflecting forward from the bucket.
If you set the bucket about halfway down and use the steering, it acts similar to a bow thruster on at the stern.
The attached link shows it quite graphically and you can hear that the engine is revving a bit rather than at idle.
Impressive driving skills in my opinion.